feat(gui): add device default option for keyboard bindings

[clifinger]

Summary

Adds a "Device default" option to the keyboard F-row action picker to allow users to unassign bindings and restore native HID++ behavior.

Changes

• openlogi-desktop: Inject a "Device default" row at the top of panel_action_rows in function_row.rs which calls commit_keyboard_binding(trigger, None).

Testing

• Verified locally that the button is rendered and works to unassign keyboard shortcuts.
• Full local gate passed (cargo fmt, cargo clippy, cargo test).

Fixes #702

[greptile-apps]

Greptile Summary

Adds a “Device default” entry to the keyboard function-row action panel so users can remove an override and restore native device behavior.

• Displays the option as selected when no binding exists.
• Clears and persists the selected key’s binding when clicked.
• Refreshes the function-row view after the reset.

Confidence Score: 5/5

The PR appears safe to merge with no actionable defects identified.

The new row uses the established binding-removal path, which clears persisted and runtime state so unassigned function keys return to native pass-through behavior.

Important Files Changed

Filename	Overview
crates/openlogi-desktop/src/features/keyboard/function_row.rs	Adds a localized reset row that correctly uses the established None binding semantics and reflects the current default state.

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